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ipv6: Separate tcp offload functionality

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Pull TCPv6 offload functionality into its won file in preparation
for moving it out of the module.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich
2012-11-15 17:36:18 -05:00
committed by David S. Miller
parent d1da932ed4
commit 8663e02aba
5 changed files with 141 additions and 110 deletions
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include/net/ip6_checksum.h
+35
View File
@@ -31,6 +31,8 @@
#include <net/ip.h>
#include <asm/checksum.h>
#include <linux/in6.h>
#include <linux/tcp.h>
#include <linux/ipv6.h>
#ifndef _HAVE_ARCH_IPV6_CSUM
@@ -91,4 +93,37 @@ static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
}
#endif
static __inline__ __sum16 tcp_v6_check(int len,
const struct in6_addr *saddr,
const struct in6_addr *daddr,
__wsum base)
{
return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
}
static inline void __tcp_v6_send_check(struct sk_buff *skb,
const struct in6_addr *saddr,
const struct in6_addr *daddr)
{
struct tcphdr *th = tcp_hdr(skb);
if (skb->ip_summed == CHECKSUM_PARTIAL) {
th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
skb->csum_start = skb_transport_header(skb) - skb->head;
skb->csum_offset = offsetof(struct tcphdr, check);
} else {
th->check = tcp_v6_check(skb->len, saddr, daddr,
csum_partial(th, th->doff << 2,
skb->csum));
}
}
static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
{
struct ipv6_pinfo *np = inet6_sk(sk);
__tcp_v6_send_check(skb, &np->saddr, &np->daddr);
}
#endif